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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 4
21.
In brushless excitation system of modern alternators, the main exciter is
dc generator
ac generator
either dc or ac generator
induction generator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The two-transistor model of a thyristor consists of two transistors :
one n-p-n and other p-n-p
both p-n-p
both n-p-n
one n-p-n and other UJT
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In a thyristor, the forward breakover voltage
is constant
may be constant or may depend on gate current
decreases as gate current is increased
increases as gate current is increased
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The gate lead, in a thyristor is welded to :
p layer to which anode is connected
n layer nearest to the anode terminal
p layer nearest to the cathode terminal
outside n layer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage
will have positive part only
will have both positive and negative parts
may have both positive and negative parts
will have negative part if load is inductive
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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